Journal
CELLULOSE
Volume 25, Issue 9, Pages 5089-5097Publisher
SPRINGER
DOI: 10.1007/s10570-018-1938-5
Keywords
Cellulose nanofibers; Polyacrylamide; Double-network gel; Gelation treatment; High strength
Funding
- Special Budget Smart-Materials'' of the Ministry of Education, Culture, Sports, Science and Technology (MEXT), Japan
- Natural Science Foundation of Jiangsu Province (CN) [BK20170925]
- National Natural Science Foundation of China (NSFC) [31670555]
- Innovation Fund for Young Scholars of Nanjing Forestry University [CX 2017001]
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Previously, we reported an efficient method to prepare tough hydrogels from cellulose nanofibers using an alkali treatment which had an nano-network structure. In this study, polyacrylamide/cellulose nanofiber (PAM/CNF) double-network (DN) gels were synthesized by simply using 15 wt% NaOH at room temperature. The compression properties and morphology of the gels were investigated. The main findings showed that the compressive stress of the PAM/CNF DN gel (CNF content of 5.7 wt%) was more than 15-fold higher than the pure PAM. When compared with the PAM/CNF gel prepared without alkali treatment, the mechanical properties of the PAM/CNF DN gel showed approximately 2-fold improvement. Analysis of this DN gel morphology further demonstrated that the CNF network (formed via 15 wt% NaOH treatment) was embedded in the PAM matrix, thereby increasing the strength of the hybrid gels. In summary, PAM/CNF DN gels with significantly improved mechanical properties could be prepared using a simple method, which provide great potential as bio-medical load-bearing gel materials.
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